Liner for aluminum drill guide feed

ABSTRACT

A replaceable wear resistant liner for the wearing surface of an aluminum guide feed used on rock drills.

United States Patent Hughes [4 1 Mar. 21, 1972 [54] LINER FOR ALUMINUM DRILL GUIDE 1,304,442 5 1919 Bayles et a1 ..308/3 FEED 1,957,472 5/1934 Pankratz 1,981,992 11/1934 Curtis [72] Imam" Hughes Easton' 1,595,938 8/1926 Holman ..308/3 [73] Assignee: Ingersoll-Rand Company, New York, NY. [22] Filed, Nov. 20 1970 Primary Examiner-Martin P. Schwadron Assistant Examiner-Ronald H. Lazarus [2]] Appl' Attorney-Car1 R. Horten, David W. Tibbott and Frank S.

Troidl [52] US. Cl. ..308/3 A [51] Int. Cl. ..F16c 29/00 [57] ABSTRACT [58] Field of Search ..308/3 A, 3 R; 175/422;

173/152, 161 A replaceable wear reslstant liner for the wearing surface of an aluminum guide feed used on roclk drills. 56 R f C: d 1 8 mnces e 2 Claims, 2 Drawing Figures UNITED STATES PATENTS 1,699,636 1/1929 Smith ..308/3 I mm m V Liam INVENTOR ROBERT W HUGHES M QTMWM,

Patented March 21, 1972 ATTORNEY LINER FOR ALUMINUM DRILL GUIDE FEED BACKGROUND OF THE INVENTION The present invention relates to drill guides. More particular reference is made to an inexpensive, easily replaced liner for the guide feed of rock drills.

The use of aluminum shapes for drill guide feeds has been relatively common. However, the softness of aluminum results in wear which has required time consuming and costly replacements in the field. Also, the replacement operation usually requires the removal of the drill. The commercial alternative has been to use an all-steel drill guide feed which is heavy and cumbersome. This invention incorporates a liner in extruded aluminum drill guide feeds which will provide the following advantages:

1 Wear resistance and longer periods between shut downs.

2. A relatively simple and easy means of retaining and of replacing the worn element.

3. A means of attachment which is essentially selfretaining.

4. Availability and economy.

BRIEF DESCRIPTION OF THE DRAWING FIG. 1 is an elevational viewof a rock drill mounted on a drill feed guide.

FIG. 2 is an elevational, sectional view of an apparatus including a drill-mounting plate, a feed screw, adrill guide feed, a replaceable liner, and a means for retaining and releasing the liner.

DESCRIPTION OF THE INVENTION Referring to the drawings wherein similar reference characters designate corresponding parts throughout the views, FIG. 1 shows the environment in which this invention operates, while FIG. 2 illustrates the apparatus comprising a liner for an aluminum drill guide feed shell 12 which is loosely slidable in a groove 14 formed by the involuted portion 15 of the feed shell 12. A series of apertures 16 are drilled in the guide feed shell with a spacing of approximately, but not limited to, 15 inches. The apertures are located such that a recess 18 on a bolt 20 is flush with the bottom surface 22 of the groove 14. A

. washer 24 and a locking nut 26 retain the bolt 20.

To install the liner 10 in the drill guide feed shell 12 the bolts 20 are inserted into the aperture 16 with the recess 18 flush with the surface 22 of the groove. The liner is inserted into the groove from either end. A washer 24 is installed with a locking nut 26 which is tightened until the shoulder 28 of the bolt 20 retains the back 30 of the liner against the back of the groove. Thus, as the drill mounting plate 32 is caused to traverse the guide 12 by the feed screw 34 it is supported on the steel liner 10. To replace the liner the nuts 26 are loosened, the worn liner is slipped out of the end of the guide shell and inverted, or a new steel liner inserted into the guide, and the locking nuts retightened. Inversion can double the life of a liner, as the part is symmetrical, but the wear pattern generally is not. It is unnecessary to remove the drill to replace the liner. Further, if one or more of the locking nuts should vibrate loose, the recess of the bolt will restrain the bolt from interfering with the movement of the drill plate 32 and from working out of the aperture 16.

From the aforegoing, it may be seen that I have provided new and improved means for accomplishing all of the objects and advantages of my invention. While this is the preferred embodiment of this invention, it can be readily seen that variations are possible, such as V-shaped liners, asymmetrical liners which lack the advantage of reversibility, the elimination of the washer by providing the locking nut with a shoulder, or the use of internal threads at one end of the bolt.

I claim:

1. A guiding device for use with a rock drill comprising a drill guide feed shell of light metal composition having a rigid base section, two guide sections extending from the base defining therewith a recess for a rock drill feed screw, said guide sections comprisin a body portion and an involuted portion which defines M the body portion a duct parallel to the longitudinal axis of the base, and ducts forming parallel guides for a drill mounting plate, and

a liner having two projections slidably inserted in each guide section duct to provide a channel for a drill mounting plate, and

the guide sections further having a plurality of spaced aperture aligned along the length of the section, wherein retaining members for each liner are positioned to secure the liner within the duct of the shell.

2. The guiding device of claim 1 wherein the feed shell is of aluminum composition, the base section is flat on one side, the guide sections arcuately extend from the other side of the base having an inwardly involuted portion defining rectangular ducts, the apertures extend through the body portion of the guides parallel to the flat of the base section and contiguous with a duct wall, and

wherein the liner is of steel composition having a flat base with two symmetrical and parallel projections extending perpendicularly therefrom, and wherein the retaining member is slidably positioned in the aligned apertures of the guide feed shell, further having a threaded portion, a restraining portion comprising a recess to slidably receive a liner projection, and a lip to abut with the end of the liner projection, and a positioning member with an enlarged shoulder threadedly mating with the retaining member whereby the retaining member duct of the shell. 

1. A guiding device for use with a rock drill comprising a drill guide feed shell of light metal composition having a rigid base section, two guide sections extending from the base defining therewith a recess for a rock drill feed screw, said guide sections comprising a body portion and an involuted portion which defines with the body portion a duct parallel to the longitudinal axis of the base, and ducts forming parallel guides for a drill mounting plate, and a liner having two projections slidably inserted in each guide section duct to provide a channel for a drill mounting plate, and the guide sections further having a plurality of spaced aperture aligned along the length of the section, wherein retaining members for each liner are positioned to secure the liner within the duct of the shell.
 2. The guiding device of claim 1 wherein the feed shell is of aluminum composition, the base section is flat on one side, the guide sections arcuately extend from the other side of the base having an inwardly involuted portion defining rectangular ducts, the apertures extend through the body portion of the guides parallel to the flat of the base section and contiguous with a duct wall, and wherein the liner is of steel composition having a flat base with two symmetrical and parallel projections extending perpendicularly therefrom, and wherein the retaining member is slidably positioned in the aligned apertures of the guide feed shell, further having a threaded portion, a restraining portion comprising a recess to slidably receive a liner projection, and a lip to abut with the end of the liner projection, and a positioning member with an enlarged shoulder threadedly mating with the retaining member whereby the retaining member may be axially positioned to secure the liner within the duct of the shell. 